marshall



c. K. MARSHALL. 1

Grate. I No. 79,845. Patented July 14, I868.

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A if a l a I i l l i'li'l'l" il'l" Z" V w mwm y w dw N PETERS PHOTOLITHOGRAPHER, WASHINGTON. D. C,

0. K. MARSHALL, 0F NEW-ORLEANS,LOUISIANA.

Letters Patent No. 79,845, dated July 14, 1868;. anteda tecl June27, 1868,

IMPROVEMENT in GOAL-GRATBS AND sr'ovnst fitlgt fitlgttule refrmt tt'in flgtst gutters fittest ant mating part ttflge 5mm.

TO ALL WHOM ITMAY CONCERN Be it known that I; G. .K. MARSHALL, of New Orleans, parish of Orleans, and State of Louisian.a,.vha ve invented certain new and useful Improvements in Fire-Grates; and I do hercby declare that the following is a full, clear, andexactdescription'of the same, reference being had to the annexed drawings, and to the letters of reference marked thereon,and making part of this specification, in which- Figure 1' is a frontview, the dotted lines on the face of the fluted tile showing the internal grooves.

Figure 2 is a sectional view.

Figure 3js .a plan view.

Figurefl'is a plan'view of the tile, illustrating an interior section of the same.

It is a well-known fact that in open fire-grates,.as at present constructed, but a small portion'of'theair which is heated'by the combustionof the fuel is introduced into the room or apartment which it is desired to warm. In order to have a free draught, the back tiles are invariably placedin an angular position, so that there maybe alarge and free opening'at the point of contact with the fine of the chimney, and the consequence is that a great'portion of the air is carried, by the force of the draught, through the chimney-flue, instead of being thrown into the room for the purpose warming the same. i

To devise some means to remedy this evil has long been considered a great desideratum, and is the object of my present invention. I v I The nature of my invention consists in constructing the tile with an internal groove or grooves, and ccnnecting said groove or grooveswith a.supply pipe, by which 'fresh air is constantly introduced into the bbdyof the tile, by means-of which the air, after ithas become thoroughly heated by its passage through the tile, is discharged into the room. 4 I

My invention also consists in arranging a damper-immediately above the tile, so that when the apartment beeomes uncomt'ortably warm, the course of the current of air, introduced through the agency of the supplypipe, can readily be changed, and, instead of being thrown into the room, will be made to escape by means of the chimney-flue.

. My-invention also consists in arranging, along the bottom of the grate, a hollow triangular tile, so arranged that a passage is left for the fuel between the same and front bars of the grate, and also between the triangular and back tiles, so that, when the grate is properly filled, the entire tile will be embedded in the coal. This triangular tile 'is connectpdwith suitable opcnings in the sides of the grate, by which a constant current of fresh air is admitted and passed under the mass of heated .coal, and discharged into the room, the whole acting precisely on the same principle as do the grooves in the rear tile,vbefore referred to.

lo enable others skilled in the art to make and use my invention, I will proceed to describe its construction .and operation.

' A is au opcn fireplace, and may be faced with stone, metal, or any other suitable material, and constructed inany of the usual forms.

l B is an ordinary grate, and suspended in tbc'iireplaceA in the usual manner. 7

G is a rear tile of the grate, and may be made either of fire-clay, soapstone, or any other like material,

and its face may be either plain or iluted. Within the body fof this tile G, I introduce one or more grooves, c,

so arrangedthat they will either serve as a passage for the air within and across the entire tile, or as a passage, when the damper is turned, to conveythe same to the chimney-flue. These grooves 0 can be introduced into .the body of the tile with but little trouble, and'adding scarcely at all to the expense of the same. The fire-clay, whilein-a plastic state, can readily be manipulated for the purpose, while the soapstone, when taken from the quarry, and before the same is exposed to 'the action of the atmosphere or heat, is equally easy to work.

D is a triangular-tile, arranged horizontally-across the centre of the grate, the base of the file being in such proportion to the width of the bottom of the grate that a passage is left forthe coal between the same and the back tile, andalso between the same and the front bars of the grate. This tile!) is hollowed out or grooved like 0, and the spaces thus formed are connected with suitable openings in the side of the grate, in like rnanner with those-in G, and for'the same purpose. 1

E and F are two straight pipes, with curved elbows, or of any other desired form. These pipes-enter the groove dot the tile 0 sut'nciently far to enable a, tight connection to be secured between said pipes'and the.

groove 0. v

e and f are two dampers, which cover the mouths of the pipes E and F. When these dampers are open, a.

current of fresh air is constantly introduced into the grooves c, and caused to pass through the tile 0. The

air becoming heated in its transit thrpugh the tile, is discharged into the/room by means of the pipe F.'

G isa damper ontop of the triangular tile D, andeorers the mouth of the groove 0. By turning this damper, the course of the air-can readily be changed, so that, instead of passing through the tile and being disehargedinto'the room by means of the pipe F,'it can be caused topass out through the chimney-flue.

Practical experience "has fully attested-this fact, that a grate construo'tedon the plan herein described will, with the same amount of fuel, afford more than twice the amount of heat to theopartment than can possibly be ohtained from a grate constructed on theprinciple of the one now in general use.

Having thus fully described my invention, what I claim therein as new, and desire to secure by Letters Patent, is I 1. The tile 0, with its internal grooves e c, in combination with the pipes E and F, or their equivalents, and the grate B, when the seine are constructed and arranged substantially as deseribed, and for the purpose set forth. i

2. The tile C, with its internal grooves c c,in combination with the pipes E and F, and damper G, when the same are constructed and arranged substantially as described, and for the purpose seti'orth.

3. Arranging, in the bottom of an open fire-grate, a hollow triangular tile, D, when the same is connected \vith'openings in the side of the grate, substantially as described.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses,

C. K. MARSHALL. Witnesses Jenn D. BLOOR, JOHN S. HOLLINGSHEAD. 

